Apache Poi 操作word，替换字符保留样式问题，runs段落混乱问题。

关于这个问题也是刚好遇到，一通搜索也没有找到类似的或者是有效的方法。下面介绍一下。

首先apache poi的引入

        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>4.1.2</version>
        </dependency>

        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>4.1.2</version>
        </dependency>

  
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml-schemas</artifactId>
            <version>4.1.2</version>
        </dependency>

        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-scratchpad</artifactId>
            <version>4.1.2</version>
        </dependency>    

<!-- poi_tl 工具，仅支持docx且友好
        开源，官方文档：http://deepoove.com/poi-tl/1.10.x/
        -->
        <dependency>
            <groupId>com.deepoove</groupId>
            <artifactId>poi-tl</artifactId>
            <version>1.10.0</version>
        </dependency>

上面的包都是一些基础的东西，然后需要注意的是版本问题。因为版本不一样可能导致的用法也不一样。 poi-tl 1.10.0 版本需要poi 4.1.2的版本来支持。这个官方的作者已经说了。

下面直接上 替换word的代码

 　　　　XWPFDocument document = new XWPFDocument(in);

        List<XWPFParagraph> paragraphs = document.getParagraphs();

        Map<String, String> replacements = new HashMap<>();
　　　　//这里是找回替换的特殊字符，我是通过正则去找回的。因为我的比较多。而且我一般习惯${}的写法。
　　　　//当然poi-tl也可以直接替换很方便，但是这里用的是原生的apache poi。因为担心poi-tl还不是很成熟。
        List<String> replaceFields = retrieveReplaceFields(document, regex);
        for (String replaceField : replaceFields) {
            String factField = StringUtils.substringBetween(replaceField, prefix, suffix);
            String val = retrieveData(factField, data);
            replacements.put(replaceField,val);
        }
　　　　//这里是普通段落
        replaceInParagraphs(replacements,paragraphs);

        //处理表格
        Iterator<XWPFTable> iterator = document.getTablesIterator();
        while (iterator.hasNext()) {
            XWPFTable table = iterator.next();
            List<XWPFTableRow> rows = table.getRows();
            for (XWPFTableRow row : rows) {
                List<XWPFTableCell> tableCells = row.getTableCells();
                for (XWPFTableCell cell : tableCells) {
                    List<XWPFParagraph> cellParagraphs = cell.getParagraphs();
                    replaceInParagraphs(replacements,cellParagraphs);
                }
            }
        }

        ByteArrayOutputStream output = new ByteArrayOutputStream();
  
        document.write(output);
      document.write(new FileOutputStream("C:\\Users\\dato\\Desktop\\dato.docx"));

这其中最重要替换方法来了：

replaceInParagraphs(replacements,cellParagraphs);

private static long replaceInParagraphs(Map<String, String> replacements, List<XWPFParagraph> xwpfParagraphs) {
    long count = 0;
    for (XWPFParagraph paragraph : xwpfParagraphs) {
        List<XWPFRun> runs = paragraph.getRuns();
        for (Map.Entry<String, String> replPair : replacements.entrySet()) {
            String find = replPair.getKey();
            String repl = replPair.getValue();
            TextSegment found = paragraph.searchText(find, new PositionInParagraph());
            if ( found != null ) {
                count++;
                if ( found.getBeginRun() == found.getEndRun() ) {
                    // whole search string is in one Run
                    XWPFRun run = runs.get(found.getBeginRun());
                    String runText = run.getText(run.getTextPosition());
                    String replaced = runText.replace(find, repl);
                    run.setText(replaced, 0);
                } else {
                    // The search string spans over more than one Run
                    // Put the Strings together
                    StringBuilder b = new StringBuilder();
                    for (int runPos = found.getBeginRun(); runPos <= found.getEndRun(); runPos++) {
                        XWPFRun run = runs.get(runPos);
                        b.append(run.getText(run.getTextPosition()));
                    }
                    String connectedRuns = b.toString();
                    String replaced = connectedRuns.replace(find, repl);
                    // The first Run receives the replaced String of all connected Runs
                    XWPFRun partOne = runs.get(found.getBeginRun());
                    partOne.setText(replaced, 0);
                    // Removing the text in the other Runs.
                    for (int runPos = found.getBeginRun()+1; runPos <= found.getEndRun(); runPos++) {
                        XWPFRun partNext = runs.get(runPos);
                        partNext.setText("", 0);
                    }
                }
            }
        }
    }
    return count;
}